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Chapter 2  Grid, Utility Computing and Clusters 

The Nature of Grid

Parameter

Electrical Power grid

Computational Power grid

Resources

Heterogeneous: thermal, hydro, wind, solar, nuclear, others

PCs, workstations, clusters, and others; driven by different operating and management systems

Network

Transmission lines, underground cables. Various sophisticated schemes for line protection.

Internet is the carrier for connecting distributed resources, load, and so on.

Analogous quantities

Bus Energy transmission Voltage

Node Computational transmission  Bandwidth

Power source

Power station (turbo generators, hydro generators), windmill

Grid resource (computers, data sources, Web services, databases)

Load type

Heterogeneous application devices: for example, mechanical energy for fans electricity for TVs, heat for irons

Heterogeneous applications: for example, graphics for multimedia applications, problem solving for scientific or engineering applications

Security / safety

Fuses, circuit breakers, and so on

Firewalls, public-key infrastructure, and PKI-based grid security

Storage

Only storage for low-power DC using batteries.

No storage of computational power is possible.

Automated accounting

Advanced metering and accounting mechanisms are in place

Local resource management systems support accounting. Resource brokers can meter resource consumption

Standards body

Many standardization bodies exist for various components, devices, system operation, and so on. (For example, the IEEE publishes standards on transformers, harmonics, and so on.)

Forums such as Global Grid Forum and the P2P Working Group promote community practices. The IETF and W3C handle Internet and Web standardization issues.

Source: Rajkumar Buyya and Madhu Chetty

Table 2.1 Electrical and computational Power grids: A comparison.


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